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#include "rb_lapack.h"
extern VOID dsbgv_(char* jobz, char* uplo, integer* n, integer* ka, integer* kb, doublereal* ab, integer* ldab, doublereal* bb, integer* ldbb, doublereal* w, doublereal* z, integer* ldz, doublereal* work, integer* info);
static VALUE
rblapack_dsbgv(int argc, VALUE *argv, VALUE self){
VALUE rblapack_jobz;
char jobz;
VALUE rblapack_uplo;
char uplo;
VALUE rblapack_ka;
integer ka;
VALUE rblapack_kb;
integer kb;
VALUE rblapack_ab;
doublereal *ab;
VALUE rblapack_bb;
doublereal *bb;
VALUE rblapack_w;
doublereal *w;
VALUE rblapack_z;
doublereal *z;
VALUE rblapack_info;
integer info;
VALUE rblapack_ab_out__;
doublereal *ab_out__;
VALUE rblapack_bb_out__;
doublereal *bb_out__;
doublereal *work;
integer ldab;
integer n;
integer ldbb;
integer ldz;
VALUE rblapack_options;
if (argc > 0 && TYPE(argv[argc-1]) == T_HASH) {
argc--;
rblapack_options = argv[argc];
if (rb_hash_aref(rblapack_options, sHelp) == Qtrue) {
printf("%s\n", "USAGE:\n w, z, info, ab, bb = NumRu::Lapack.dsbgv( jobz, uplo, ka, kb, ab, bb, [:usage => usage, :help => help])\n\n\nFORTRAN MANUAL\n SUBROUTINE DSBGV( JOBZ, UPLO, N, KA, KB, AB, LDAB, BB, LDBB, W, Z, LDZ, WORK, INFO )\n\n* Purpose\n* =======\n*\n* DSBGV computes all the eigenvalues, and optionally, the eigenvectors\n* of a real generalized symmetric-definite banded eigenproblem, of\n* the form A*x=(lambda)*B*x. Here A and B are assumed to be symmetric\n* and banded, and B is also positive definite.\n*\n\n* Arguments\n* =========\n*\n* JOBZ (input) CHARACTER*1\n* = 'N': Compute eigenvalues only;\n* = 'V': Compute eigenvalues and eigenvectors.\n*\n* UPLO (input) CHARACTER*1\n* = 'U': Upper triangles of A and B are stored;\n* = 'L': Lower triangles of A and B are stored.\n*\n* N (input) INTEGER\n* The order of the matrices A and B. N >= 0.\n*\n* KA (input) INTEGER\n* The number of superdiagonals of the matrix A if UPLO = 'U',\n* or the number of subdiagonals if UPLO = 'L'. KA >= 0.\n*\n* KB (input) INTEGER\n* The number of superdiagonals of the matrix B if UPLO = 'U',\n* or the number of subdiagonals if UPLO = 'L'. KB >= 0.\n*\n* AB (input/output) DOUBLE PRECISION array, dimension (LDAB, N)\n* On entry, the upper or lower triangle of the symmetric band\n* matrix A, stored in the first ka+1 rows of the array. The\n* j-th column of A is stored in the j-th column of the array AB\n* as follows:\n* if UPLO = 'U', AB(ka+1+i-j,j) = A(i,j) for max(1,j-ka)<=i<=j;\n* if UPLO = 'L', AB(1+i-j,j) = A(i,j) for j<=i<=min(n,j+ka).\n*\n* On exit, the contents of AB are destroyed.\n*\n* LDAB (input) INTEGER\n* The leading dimension of the array AB. LDAB >= KA+1.\n*\n* BB (input/output) DOUBLE PRECISION array, dimension (LDBB, N)\n* On entry, the upper or lower triangle of the symmetric band\n* matrix B, stored in the first kb+1 rows of the array. The\n* j-th column of B is stored in the j-th column of the array BB\n* as follows:\n* if UPLO = 'U', BB(kb+1+i-j,j) = B(i,j) for max(1,j-kb)<=i<=j;\n* if UPLO = 'L', BB(1+i-j,j) = B(i,j) for j<=i<=min(n,j+kb).\n*\n* On exit, the factor S from the split Cholesky factorization\n* B = S**T*S, as returned by DPBSTF.\n*\n* LDBB (input) INTEGER\n* The leading dimension of the array BB. LDBB >= KB+1.\n*\n* W (output) DOUBLE PRECISION array, dimension (N)\n* If INFO = 0, the eigenvalues in ascending order.\n*\n* Z (output) DOUBLE PRECISION array, dimension (LDZ, N)\n* If JOBZ = 'V', then if INFO = 0, Z contains the matrix Z of\n* eigenvectors, with the i-th column of Z holding the\n* eigenvector associated with W(i). The eigenvectors are\n* normalized so that Z**T*B*Z = I.\n* If JOBZ = 'N', then Z is not referenced.\n*\n* LDZ (input) INTEGER\n* The leading dimension of the array Z. LDZ >= 1, and if\n* JOBZ = 'V', LDZ >= N.\n*\n* WORK (workspace) DOUBLE PRECISION array, dimension (3*N)\n*\n* INFO (output) INTEGER\n* = 0: successful exit\n* < 0: if INFO = -i, the i-th argument had an illegal value\n* > 0: if INFO = i, and i is:\n* <= N: the algorithm failed to converge:\n* i off-diagonal elements of an intermediate\n* tridiagonal form did not converge to zero;\n* > N: if INFO = N + i, for 1 <= i <= N, then DPBSTF\n* returned INFO = i: B is not positive definite.\n* The factorization of B could not be completed and\n* no eigenvalues or eigenvectors were computed.\n*\n\n* =====================================================================\n*\n* .. Local Scalars ..\n LOGICAL UPPER, WANTZ\n CHARACTER VECT\n INTEGER IINFO, INDE, INDWRK\n* ..\n* .. External Functions ..\n LOGICAL LSAME\n EXTERNAL LSAME\n* ..\n* .. External Subroutines ..\n EXTERNAL DPBSTF, DSBGST, DSBTRD, DSTEQR, DSTERF, XERBLA\n* ..\n\n");
return Qnil;
}
if (rb_hash_aref(rblapack_options, sUsage) == Qtrue) {
printf("%s\n", "USAGE:\n w, z, info, ab, bb = NumRu::Lapack.dsbgv( jobz, uplo, ka, kb, ab, bb, [:usage => usage, :help => help])\n");
return Qnil;
}
} else
rblapack_options = Qnil;
if (argc != 6 && argc != 6)
rb_raise(rb_eArgError,"wrong number of arguments (%d for 6)", argc);
rblapack_jobz = argv[0];
rblapack_uplo = argv[1];
rblapack_ka = argv[2];
rblapack_kb = argv[3];
rblapack_ab = argv[4];
rblapack_bb = argv[5];
if (argc == 6) {
} else if (rblapack_options != Qnil) {
} else {
}
jobz = StringValueCStr(rblapack_jobz)[0];
ka = NUM2INT(rblapack_ka);
if (!NA_IsNArray(rblapack_ab))
rb_raise(rb_eArgError, "ab (5th argument) must be NArray");
if (NA_RANK(rblapack_ab) != 2)
rb_raise(rb_eArgError, "rank of ab (5th argument) must be %d", 2);
ldab = NA_SHAPE0(rblapack_ab);
n = NA_SHAPE1(rblapack_ab);
if (NA_TYPE(rblapack_ab) != NA_DFLOAT)
rblapack_ab = na_change_type(rblapack_ab, NA_DFLOAT);
ab = NA_PTR_TYPE(rblapack_ab, doublereal*);
uplo = StringValueCStr(rblapack_uplo)[0];
if (!NA_IsNArray(rblapack_bb))
rb_raise(rb_eArgError, "bb (6th argument) must be NArray");
if (NA_RANK(rblapack_bb) != 2)
rb_raise(rb_eArgError, "rank of bb (6th argument) must be %d", 2);
ldbb = NA_SHAPE0(rblapack_bb);
if (NA_SHAPE1(rblapack_bb) != n)
rb_raise(rb_eRuntimeError, "shape 1 of bb must be the same as shape 1 of ab");
if (NA_TYPE(rblapack_bb) != NA_DFLOAT)
rblapack_bb = na_change_type(rblapack_bb, NA_DFLOAT);
bb = NA_PTR_TYPE(rblapack_bb, doublereal*);
kb = NUM2INT(rblapack_kb);
ldz = lsame_(&jobz,"V") ? n : 1;
{
na_shape_t shape[1];
shape[0] = n;
rblapack_w = na_make_object(NA_DFLOAT, 1, shape, cNArray);
}
w = NA_PTR_TYPE(rblapack_w, doublereal*);
{
na_shape_t shape[2];
shape[0] = ldz;
shape[1] = n;
rblapack_z = na_make_object(NA_DFLOAT, 2, shape, cNArray);
}
z = NA_PTR_TYPE(rblapack_z, doublereal*);
{
na_shape_t shape[2];
shape[0] = ldab;
shape[1] = n;
rblapack_ab_out__ = na_make_object(NA_DFLOAT, 2, shape, cNArray);
}
ab_out__ = NA_PTR_TYPE(rblapack_ab_out__, doublereal*);
MEMCPY(ab_out__, ab, doublereal, NA_TOTAL(rblapack_ab));
rblapack_ab = rblapack_ab_out__;
ab = ab_out__;
{
na_shape_t shape[2];
shape[0] = ldbb;
shape[1] = n;
rblapack_bb_out__ = na_make_object(NA_DFLOAT, 2, shape, cNArray);
}
bb_out__ = NA_PTR_TYPE(rblapack_bb_out__, doublereal*);
MEMCPY(bb_out__, bb, doublereal, NA_TOTAL(rblapack_bb));
rblapack_bb = rblapack_bb_out__;
bb = bb_out__;
work = ALLOC_N(doublereal, (3*n));
dsbgv_(&jobz, &uplo, &n, &ka, &kb, ab, &ldab, bb, &ldbb, w, z, &ldz, work, &info);
free(work);
rblapack_info = INT2NUM(info);
return rb_ary_new3(5, rblapack_w, rblapack_z, rblapack_info, rblapack_ab, rblapack_bb);
}
void
init_lapack_dsbgv(VALUE mLapack, VALUE sH, VALUE sU, VALUE zero){
sHelp = sH;
sUsage = sU;
rblapack_ZERO = zero;
rb_define_module_function(mLapack, "dsbgv", rblapack_dsbgv, -1);
}
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